[Fix] support multi-byte wide typed arrays

Author: ChALkeR

.eslintrc

@@ -60,5 +60,17 @@
 				"max-lines-per-function": "off",
 			},
 		},
+		{
+			"files": "hash.js",
+			"globals": {
+				"Uint8Array": false,
+			},
+		},
+		{
+			"files": "test/test.js",
+			"globals": {
+				"Uint16Array": false,
+			},
+		},
 	],
 }

hash.js

@@ -2,6 +2,10 @@
 
 var Buffer = require('safe-buffer').Buffer;
 
+var useArrayBuffer = typeof ArrayBuffer !== 'undefined'
+  && typeof Uint8Array !== 'undefined'
+  && ArrayBuffer.isView;
+
 // prototype class for hash functions
 function Hash(blockSize, finalSize) {
 	this._block = Buffer.alloc(blockSize);
@@ -12,9 +16,37 @@ function Hash(blockSize, finalSize) {
 
 Hash.prototype.update = function (data, enc) {
 	/* eslint no-param-reassign: 0 */
-	if (typeof data === 'string') {
+	if (data instanceof Uint8Array) {
+		/*
+		 * Fast path
+		 * Already single-byte wide and 0-255
+		 */
+	} else if (typeof data === 'string') {
 		enc = enc || 'utf8';
 		data = Buffer.from(data, enc);
+	} else if (useArrayBuffer && ArrayBuffer.isView(data)) {
+		// Convert all TypedArray and DataView instances to single-byte-wide Uint8Array views
+		var oldSize = data.byteLength;
+		data = new Uint8Array(data.buffer, data.byteOffset, data.byteLength);
+
+		if (!(data.byteLength === oldSize && data.byteLength === data.length)) {
+			throw new Error('Unexpected: broken Uint8Array');
+		}
+	} else {
+		if (!data || typeof data !== 'object' || typeof data.length !== 'number') {
+			throw new TypeError('Not an array-like');
+		}
+
+		// non-negative 32-bit integer
+		if ((data.length >>> 0) !== data.length) {
+			throw new RangeError('Invalid length');
+		}
+
+		for (var j = 0; j < data.length; j++) {
+			if ((data[j] & 255) !== data[j]) {
+				throw new TypeError('Not a byte array');
+			}
+		}
 	}
 
 	var block = this._block;

test/test.js

@@ -13,8 +13,9 @@ var inputs = [
 	['123456789abcdef123456789abcdef123456789abcdef123456789ab', 'ascii'],
 	['0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcde', 'ascii'],
 	['0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef', 'ascii'],
-	['foobarbaz', 'ascii']
-];
+	['foobarbaz', 'ascii'],
+	typeof Uint16Array === 'function' ? [new Uint16Array([1, 2, 3])] : null
+].filter(Boolean);
 
 tape("hash is the same as node's crypto", function (t) {
 	inputs.forEach(function (v) {
@@ -33,7 +34,7 @@ tape('call update multiple times', function (t) {
 		var sha1hash = crypto.createHash('sha1');
 
 		for (var i = 0; i < v[0].length; i = (i + 1) * 2) {
-			var s = v[0].substring(i, (i + 1) * 2);
+			var s = v[0].slice(i, (i + 1) * 2);
 			hash.update(s, v[1]);
 			sha1hash.update(s, v[1]);
 		}
@@ -72,7 +73,7 @@ tape('hex encoding', function (t) {
 		var sha1hash = crypto.createHash('sha1');
 
 		for (var i = 0; i < v[0].length; i = (i + 1) * 2) {
-			var s = v[0].substring(i, (i + 1) * 2);
+			var s = v[0].slice(i, (i + 1) * 2);
 			hash.update(Buffer.from(s, 'ascii').toString('hex'), 'hex');
 			sha1hash.update(Buffer.from(s, 'ascii').toString('hex'), 'hex');
 		}
@@ -86,6 +87,29 @@ tape('hex encoding', function (t) {
 	t.end();
 });
 
+tape('throws on invalid input', function (t) {
+	var invalid = [
+		{}, // non-arrayish
+		{ length: 20 }, // undefined values
+		[NaN], // non-numbers
+		[[]], // non-numbers
+		[1, 1.5], // non-integers
+		[1, 256], // out of bounds
+		[-1, 0] // out of bounds
+	];
+
+	invalid.forEach(function (input) {
+		var hash = new Sha1();
+
+		t['throws'](function () {
+			hash.update(input);
+			hash.digest('hex');
+		});
+	});
+
+	t.end();
+});
+
 tape('call digest for more than MAX_UINT32 bits of data', function (t) {
 	var sha1hash = crypto.createHash('sha1');
 	var hash = new Sha1();